Machine Tool Upright Drive Layout for Vibration-Stable Alloy Machining
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Solution Overview
Problem
Machine tools used for machining semi-finished titanium and aluminum alloys face challenges in achieving low machining tolerances due to vibrations within the resonance range, leading to inadequate compliance with industrial requirements, and existing efforts to increase rigidity have not yielded satisfactory results.
Innovation Solution
The machine tool design incorporates a supporting structure with increased degrees of constraint between the upright and the supporting structure, utilizing four pairs of gearmotors engaged with the upright translation means, which enhances the stiffness and first resonant frequency range to between 24 and 30 Hz, thereby improving dynamic performance and tolerance compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rigidity of the machine structures is increased to raise the resonant frequency above 23-30 Hz, then the dynamic performance and machining precision improve, but the manufacturing cost and structural complexity increase significantly
Solution Approach 1:
The patent applies dynamics by making the machine structure adaptable through variable stiffness elements. The active stiffness control system allows the machine to dynamically adjust its mechanical properties during operation, transitioning from a static rigid structure to a dynamically controllable system that can optimize performance without permanent structural complexity
Solution Approach 2:
The patent changes the stiffness parameter dynamically through active control systems. By using variable stiffness elements and control algorithms, the machine can adjust its resonant frequency and dynamic characteristics in real-time, achieving high precision machining without requiring a permanently complex rigid structure
2Manufacturing precision
If the resonant frequency is increased to 23-30 Hz to avoid titanium alloy machining vibrations, then the machining quality improves, but the machine structure becomes more complex and expensive
Solution Approach 1:
The patent substitutes passive mechanical rigidity with an active control system. Instead of relying solely on heavy rigid structures to achieve high resonant frequency, the system uses sensors, actuators, and control algorithms to actively manage vibrations and maintain machining precision, reducing the need for overly complex mechanical structures
Solution Approach 2:
The machine tool performs self-correction of vibrations through the active stiffness control system. The system continuously monitors its own dynamic behavior and automatically adjusts stiffness parameters to maintain optimal performance, eliminating the need for external intervention or overly complex passive damping structures
3Manufacturing precision
If very long production times are used to comply with dimensional tolerances for aluminum alloy machining, then the machining precision improves, but the productivity decreases
Solution Approach 1:
The patent applies dynamics by enabling real-time adjustment of machine stiffness during the machining process. This dynamic adaptability allows the system to maintain high precision machining conditions throughout operation, reducing the need for conservative slow machining parameters and thereby缩短ing production time while maintaining tolerance compliance
Solution Approach 2:
The patent implements feedback control through the active stiffness system. Sensors monitor machining conditions and dimensional accuracy in real-time, and the control system adjusts stiffness parameters accordingly to maintain precision. This closed-loop control enables faster machining speeds while ensuring tolerance compliance, improving productivity without sacrificing quality
Data Source
AI summary
The present invention relates to a machine tool (1) for machining semi-finished aluminum or titanium alloy products and comprises a supporting structure (2), an upright (4), a carriage (6) and a working head (7). The supporting structure (2) in turn comprises a bench (20) and a rear support (22) rigidly connected to each other. The bench (20) extends along a longitudinal direction (X), while the rear support (22) extends both along the longitudinal direction (X) and along a vertical direction (Y). The supporting structure (2) is also provided with upright translation means (3). The upright (4) is connected to the supporting structure (2) by means of the upright translation means (3), so as to translate along the longitudinal direction (X) and is further provided with carriage translation means (5). The carriage (6) is connected to the upright (4) by means of the carriage translation means (5) so as to be translatable along the vertical direction (Y). Finally, the working head (7) is engaged with the carriage (6). The machine tool (1) further comprises four pairs of gearmotors (81, 82, 83, 84) which are positioned aboard the upright (4) and engage with the upright translation means (3).